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Union Butterfield 1585A(UNC) High-Speed Steel Spiral Point Tap, Relieved Style, Black Oxide Finish, Round Shank with Square End, Plug Chamfer, 5/16"-18 Thread Size
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About Union Butterfield 1585A(UNC) High-Speed Steel
The Union Butterfield 1585A(UNC)/1585A(UNF) high-speed steel spiral point tap has a relieved-style design, straight flutes with a plug chamfer, black oxide finish, and a round shank with a square end, and is used to create right-hand threads in a range of materials. It is available in two different ANSI thread specification standards: UNC (Unified Coarse) and UNF (Unified Fine). The spiral point of this tap (sometimes referred to as a “gun tap”) pushes chips ahead of the tool and the straight flutes reduce clogging. Both characteristics make it suitable for threading through holes (extending through the workpiece). The black oxide finish of this tool will not chip. It improves lubricity, resists corrosion, and helps to prevent buildup and welding on the cutting edge of the tool. Relieved-style design reduces the friction between tap and workpiece for longer tool life. A plug chamfer distributes cutting to ease tapping at the beginning of the hole and to maintain correct perpendicular alignment with the workpiece. Right-hand threads are designed to tighten when a head or nut is rotated clockwise (the most common threading direction). High-speed steel (HSS) is a common general-purpose steel for cutting tools, and is compatible with a variety of materials. The round shank with square end helps to minimize rotation in the tool holder. This tool can be used in machines, such as drill presses or lathes, or with hand tools such as tap wrenches. In the Union Butterfield 1585A(UNC) and 1585A(UNF) tap series, taps with 1/4” to 5/16” nominal diameters have two flutes, and those with 3/8” to 3/4” nominal diameters have three flutes. All taps in these series have plug chamfers. This tap conforms to ANSI standards and can create threads to a depth 2 ½ times its diameter. It is suitable for ANSI 2B and 3B tolerance classes: 2B is an average quality fit for commercial and industrial fasteners; 3B produces close-tolerance fasteners used for greater resistance to st
